# Rollback Procedures

## Overview
This document provides step-by-step procedures for rolling back the HVAC Know It All Content Aggregator in case of deployment issues or system failures.

## Risk Assessment

### Severity Levels
- **CRITICAL**: System completely non-functional, no data collection
- **HIGH**: Major features broken, partial data loss
- **MEDIUM**: Some scrapers failing, degraded performance  
- **LOW**: Minor issues, cosmetic problems

## Pre-Rollback Checklist

### Before Rolling Back
1. **Document the Issue**
   - [ ] Screenshot error messages
   - [ ] Save relevant log files
   - [ ] Note exact time of failure
   - [ ] Record affected components

2. **Attempt Quick Fixes**
   - [ ] Check environment variables
   - [ ] Verify network connectivity
   - [ ] Restart failed service
   - [ ] Check disk space

3. **Backup Current State**
   ```bash
   # Backup current state before rollback
   sudo tar -czf /backup/emergency-$(date +%Y%m%d-%H%M%S).tar.gz \
     /opt/hvac-kia-content/state/ \
     /opt/hvac-kia-content/data/ \
     /var/log/hvac-content/
   ```

## Rollback Scenarios

### Scenario 1: Service Won't Start
**Symptoms:** Systemd service fails to start after deployment

**Quick Fix:**
```bash
# Check service status
systemctl status hvac-content-aggregator.service

# Check journal for errors
journalctl -u hvac-content-aggregator.service -n 100

# Validate environment
cd /opt/hvac-kia-content
python3 -c "from run_production import validate_environment; validate_environment()"
```

**Rollback Steps:**
1. Stop the timer:
   ```bash
   sudo systemctl stop hvac-content-aggregator.timer
   ```

2. Revert to previous version:
   ```bash
   cd /opt/hvac-kia-content
   git fetch --tags
   git checkout v1.0.0  # Previous stable version
   ```

3. Reinstall dependencies:
   ```bash
   pip install -r requirements.txt
   ```

4. Restart service:
   ```bash
   sudo systemctl daemon-reload
   sudo systemctl start hvac-content-aggregator.timer
   ```

### Scenario 2: Data Corruption
**Symptoms:** Malformed output, duplicate entries, missing data

**Quick Fix:**
```bash
# Check state files
ls -la /opt/hvac-kia-content/state/

# Validate JSON state files
python3 -c "import json; json.load(open('/opt/hvac-kia-content/state/youtube_state.json'))"
```

**Rollback Steps:**
1. Stop all services:
   ```bash
   sudo systemctl stop hvac-content-aggregator.timer
   sudo systemctl stop hvac-tiktok-captions.timer
   ```

2. Restore state from backup:
   ```bash
   # Find latest backup
   ls -lt /backup/hvac-state-*.tar.gz | head -1
   
   # Restore state files
   cd /
   sudo tar -xzf /backup/hvac-state-20241217.tar.gz
   ```

3. Clear corrupted output:
   ```bash
   # Move corrupted files to quarantine
   mkdir -p /opt/hvac-kia-content/quarantine
   mv /opt/hvac-kia-content/data/*_corrupted.md /opt/hvac-kia-content/quarantine/
   ```

4. Restart services:
   ```bash
   sudo systemctl start hvac-content-aggregator.timer
   ```

### Scenario 3: Performance Degradation
**Symptoms:** Slow execution, timeouts, high CPU/memory usage

**Quick Fix:**
```bash
# Check resource usage
top -p $(pgrep -f run_production.py)

# Check disk space
df -h /opt/hvac-kia-content

# Clear old logs
find /var/log/hvac-content -name "*.log" -mtime +7 -delete
```

**Rollback Steps:**
1. Reduce scraper limits temporarily:
   ```bash
   # Edit production config
   nano /opt/hvac-kia-content/config/production.py
   # Reduce max_posts, max_videos, etc.
   ```

2. Disable problematic scrapers:
   ```python
   # In config/production.py
   SCRAPERS_CONFIG = {
       "instagram": {
           "enabled": False,  # Temporarily disable
           ...
       }
   }
   ```

3. Restart with reduced load:
   ```bash
   sudo systemctl restart hvac-content-aggregator.service
   ```

### Scenario 4: Complete System Failure
**Symptoms:** Nothing works, multiple component failures

**Full System Rollback:**

1. **Stop Everything:**
   ```bash
   # Stop all timers and services
   sudo systemctl stop hvac-content-aggregator.timer
   sudo systemctl stop hvac-tiktok-captions.timer
   sudo systemctl disable hvac-content-aggregator.timer
   sudo systemctl disable hvac-tiktok-captions.timer
   ```

2. **Backup Current State:**
   ```bash
   # Full backup before rollback
   sudo tar -czf /backup/full-backup-$(date +%Y%m%d-%H%M%S).tar.gz \
     /opt/hvac-kia-content/ \
     /etc/systemd/system/hvac-*.{service,timer} \
     /var/log/hvac-content/
   ```

3. **Clean Installation:**
   ```bash
   # Remove current installation
   sudo rm -rf /opt/hvac-kia-content
   sudo rm -f /etc/systemd/system/hvac-*
   
   # Clone stable version
   cd /opt
   sudo git clone https://github.com/yourusername/hvac-kia-content.git
   cd hvac-kia-content
   sudo git checkout v1.0.0  # Last known stable
   
   # Restore configuration
   sudo cp /backup/.env /opt/hvac-kia-content/
   
   # Set permissions
   sudo chown -R $USER:$USER /opt/hvac-kia-content
   ```

4. **Reinstall Services:**
   ```bash
   cd /opt/hvac-kia-content
   ./install_production.sh
   ```

5. **Restore State (Optional):**
   ```bash
   # Only if state is not corrupted
   sudo tar -xzf /backup/hvac-state-latest.tar.gz -C /
   ```

6. **Verify and Start:**
   ```bash
   # Test first
   python3 run_production.py --dry-run
   
   # If successful, enable services
   sudo systemctl enable hvac-content-aggregator.timer
   sudo systemctl start hvac-content-aggregator.timer
   ```

## Post-Rollback Verification

### Immediate Checks
- [ ] Services are running:
  ```bash
  systemctl status hvac-content-aggregator.timer
  ```
- [ ] No errors in logs:
  ```bash
  tail -n 100 /var/log/hvac-content/aggregator.log | grep ERROR
  ```
- [ ] Test run successful:
  ```bash
  cd /opt/hvac-kia-content
  python3 test_real_data.py --source youtube --items 1
  ```

### 1-Hour Verification
- [ ] Timer fired as scheduled
- [ ] All scrapers executed
- [ ] Output files generated
- [ ] NAS sync completed
- [ ] No memory leaks
- [ ] CPU usage normal

### 24-Hour Verification
- [ ] System stable
- [ ] No missed schedules
- [ ] Data quality good
- [ ] No duplicate entries
- [ ] Incremental updates working

## Emergency Contacts

### Technical Support
- **Primary Contact:** [Name] - [Phone] - [Email]
- **Secondary Contact:** [Name] - [Phone] - [Email]
- **Escalation:** [Manager Name] - [Phone] - [Email]

### System Access
- **Server:** production-scraper.example.com
- **SSH:** `ssh user@production-scraper.example.com`
- **Logs:** `/var/log/hvac-content/`
- **Config:** `/opt/hvac-kia-content/.env`

## Recovery Time Objectives

| Scenario | Target Recovery Time | Maximum Data Loss |
|----------|---------------------|-------------------|
| Service Restart | 5 minutes | None |
| Version Rollback | 15 minutes | Since last backup |
| State Restoration | 30 minutes | 24 hours |
| Complete Rebuild | 1 hour | 48 hours |

## Lessons Learned Log

### Previous Incidents
Document any rollbacks performed and lessons learned:

| Date | Issue | Resolution | Prevention |
|------|-------|------------|------------|
| | | | |

## Backup Schedule

### Automated Backups
```bash
# Add to crontab
0 2 * * * /opt/hvac-kia-content/scripts/backup.sh
```

### Backup Script
```bash
#!/bin/bash
# /opt/hvac-kia-content/scripts/backup.sh

BACKUP_DIR="/backup/hvac-content"
DATE=$(date +%Y%m%d)
RETENTION_DAYS=30

# Create backup
tar -czf "$BACKUP_DIR/state-$DATE.tar.gz" /opt/hvac-kia-content/state/
tar -czf "$BACKUP_DIR/config-$DATE.tar.gz" /opt/hvac-kia-content/.env

# Clean old backups
find "$BACKUP_DIR" -name "*.tar.gz" -mtime +$RETENTION_DAYS -delete

# Verify backup
tar -tzf "$BACKUP_DIR/state-$DATE.tar.gz" > /dev/null 2>&1
if [ $? -eq 0 ]; then
    echo "Backup successful: $DATE"
else
    echo "Backup failed: $DATE" | mail -s "HVAC Backup Failed" alerts@example.com
fi
```

## Testing Rollback Procedures

### Monthly Drill
1. Schedule maintenance window
2. Perform controlled rollback
3. Verify recovery procedures
4. Document any issues
5. Update procedures as needed

### Test Checklist
- [ ] Backup procedures work
- [ ] Rollback completes in target time
- [ ] Data integrity maintained
- [ ] Services restart properly
- [ ] Monitoring alerts fire
- [ ] Documentation is current

---

*Last Updated: 2024-12-18*
*Version: 1.0*
*Next Review: 2025-01-18*